Electrical compression resistance unit.



P. .l. RAY.

ELECTRICAL COMPRESSION RESISTANCE UNIT.

APPLICATION FILED lAN.l0,1914.

Patented Jan. 23, 1917.

OOOOOOO entor Attorneys PAUL J. BAY, OF LAKEWOOD, OHIO.

ELECTRICAL COMPRESSION RESISTANCE UNIT.

Specification of Letters Patent.

Application 19, 1914. 8eria1No..811,433.

0 all whom it may concern:

. Be it known that I, PAUL J. RAY, acitizen of the United States, residin at Lakewood, in the county of Cuya oga and State of Ohio, have invented a new and'useful Electrical Compression Resistance Unit, of which the following is a specification.

The present invention relates to improvements in electrical compression resistance units, the present structure being an improvement upon that shown in my ap lica-. tion for a patent filed May 21, 1913, erial No. 769,112 for electric current controller and another application filed June 21, 1913,

when subjected to frequent operation, and. which does not have to be shaken or jarred to restore the initial resistance value after.

the compression has been released, the latter advantage being due to the inherent resilient characteristics of the material used in preparing the resistance disk.

A further object of the invention is the provision of an electrical compression re-.

sistance unit provided with a simplified heat radiator disposed to give maximum radiating surface and to be contained in a minimum space.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood thatchanges in the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed without departing from the spirit of the invention.

In the drawingsFigure 1 is a side elevation of the complete device constructed as a compression rheostat, the unit being broken away to foreshorten the same. Fig. 2 is an enlarged longitudinal sectional view through the resistance unit and the radiator. Fig. 3 is a section taken on line 3-3 of Fi 1.

l leferring to the drawings, the numeral 1 designates a support which constitutes with and sleeve attheextreme end of the sleeve 9, several washers of insulating terial 10 being disposed within the tube 4' the clamp 2, which is a two membered means, a proper carrying member for the resistance unit, which, as will presently appear, is mounted in the sleeve 3 of insulation disposed within the clamp 2.

A metal tube 4 is lined with a tube 5 of insulating material and mounted within said insulating tube is a plurality of resistance disks 6, the same being so constructed as to have their resistance increased as the compression thereupon is released and have their resistance reduced as the same are compressed more closely to ether.

In the lower end 0 the insulating1 tube 'sk is a metal disk 7 carrying the concentric stem 8 which projects .through an insulating about the sleeve 9 while several washers 11 of insulating material are disposed about the illustrated in Fig. 2. The outer end of the stem 8 is threaded'to receive the terminal carrying nuts 12'to which is connected-the terminal wire or plate 13.

Mounted in the open end of the sleeve 5 is an insulating bushing 14 in which is mounted for sliding movement, the stem 15 carrying the terminal late 17 and the button 16 of insulation. pon the inner end of the stem 15 within the tube 5, as at 18, is attached a screw 19 which is connected to and carries the terminal disk 29 which acts as a means for compresing the compression disks 6 between it and the disk As shown in my co-pending application Serial No. 775,158, a resilient compression transmitting member 21 abuts the button 16 and is operated by the lever cam 22, as therein described to produce the desired compression action upon the compression disks 6, the member 21 being so constructed as to normally hold the disks 6 in proper contact to prevent any air gaps therebetween as particularly expressed in both of the above mentioned applications.

Patented Jan. 23, 1917.

stem exteriorly of the metal tube 4, as clearly I unit having a plurality of conductor mem bers whose surfaces are coated with carborundum mixed with an adhesive compound.

2. An electrical compression resistance unit having a plurality of conductor disks whose surfaces are coated with carborundum mixed with silicate of soda.

3. An electrical compression resistance unit having a plurality of conductor members whose surfaces are coated with amorphous carborundum mixed with an adhesive compound.

4. An electrical compression resistance unit having a plurality of conductor disks whose surfaces are coated with amorphous carborundum mixed with silicate of soda.

5. An electrical compression resistance unit having a lurality of conductor members whose sur aces are coated with conductive material having abrasive properties, mixed with an adhesive compound.

In testimony that I claim the foregoing as my own, I have hereto aflixed my signature in the presence of two witnesses.

PAUL J. RAY. Witnesses:

CLIFFORD B. PLANGK, E. D. RAY. 

